Life improvement and repair of fatigue cracks in welded joints by hammer peening
- Norwegian Inst. of Technology, Trondheim (Norway). Dept. of Civil Engineering
Hammer peening is an effective method for extending the life of welded joints by the introduction of a deep compressive stress field which delays crack growth. In this paper hammer peening is examined as a repair method for cracks in welded T-joints. Fatigue cracks were grown is as-welded joints to depths from approximately 0.5 mm to 2 mm. The crack line was then hammer peened following typical peening procedures. The remaining fatigue life of components with untreated cracks of these sizes would constitute from a few hundred cycles to a few percent of the told life. The fatigue strength of the repaired specimens was compared with data from earlier tests on as-welded specimens and specimens that had been improved by weld toe grinding followed by hammer peening. All tests were carried out at constant amplitude loading in air. The material was a low carbon micro alloyed steel of 360 MPa yield strength. The specimens were T-joints with non-load carrying welds loaded in four point bending.
- OSTI ID:
- 205421
- Report Number(s):
- CONF-950695--; ISBN 0-7918-1309-6
- Country of Publication:
- United States
- Language:
- English
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